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        <h1 class="title">Java设计模式之Factory Method模式</h1>
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            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-Java设计模式之Factory-Method模式"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : Java设计模式之Factory Method模式</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#概述"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">概述</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#Factory-Method模式中的角色"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">Factory Method模式中的角色</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#程序示例-简洁版"><span class="post-toc-number">1.3.</span> <span class="post-toc-text">程序示例-简洁版</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#示例程序的类图"><span class="post-toc-number">1.3.1.</span> <span class="post-toc-text">示例程序的类图</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#示例程序-工厂方法的重载"><span class="post-toc-number">1.4.</span> <span class="post-toc-text">示例程序-工厂方法的重载</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#示例程序的类图-1"><span class="post-toc-number">1.4.1.</span> <span class="post-toc-text">示例程序的类图</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#示例程序-工厂方法的隐藏"><span class="post-toc-number">1.5.</span> <span class="post-toc-text">示例程序-工厂方法的隐藏</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#示例程序的类图-2"><span class="post-toc-number">1.5.1.</span> <span class="post-toc-text">示例程序的类图</span></a></li></ol></li></ol></li></ol>
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        <h1 class="post-card-title">Java设计模式之Factory Method模式</h1>
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            <time class="post-time" title="2019-09-05 09:23:20" datetime="2019-09-05T09:23:20.000Z"  itemprop="datePublished">2019-09-05</time>

            


            

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            <h2 id="学习笔记-Java设计模式之Factory-Method模式"><a href="#学习笔记-Java设计模式之Factory-Method模式" class="headerlink" title="学习笔记 : Java设计模式之Factory Method模式"></a>学习笔记 : Java设计模式之Factory Method模式</h2><h3 id="概述"><a href="#概述" class="headerlink" title="概述"></a>概述</h3><p><em>工厂方法模式 : 定义一个用于创建对象的接口,但是让子类决定将哪一个类实例化. 工厂方法模式让一个类的实例化延迟到其子类. ( Factory Method Pattern : Definde an interface for creating an object,but let subclasses decides which class to instantiate. Factory Method lets a class defer instantiation to sublclasses )</em></p>
<ul>
<li>工厂方法模式是简单工厂模式的延伸,它继承了简单工厂模式的优点,同时还弥补了简单工厂模式的缺陷,使其更好地符合开闭原则的要求. 工厂方法模式简称为工厂模式( Factory Pattern ),又可称为虚拟构造器模式( Virtual Constructor Pattern )或多态工厂模式( Polymorphic Factory Pattern ). 其为一种类创建型模式哟 ~</li>
</ul>
<h3 id="Factory-Method模式中的角色"><a href="#Factory-Method模式中的角色" class="headerlink" title="Factory Method模式中的角色"></a>Factory Method模式中的角色</h3><ol>
<li><em><code>Product (抽象产品)</code> : 它是定义产品的接口,是工厂方法模式所创建对象的超类型,也是产品对象的公共父类.</em></li>
<li><em><code>ConcreteProduct (具体产品)</code> : 它实现了抽象产品接口,某种类型的具体产品由专门的具体工厂创建,具体工厂和具体产品间一一对象.</em></li>
<li><em><code>Factory (抽象工厂)</code> : 在抽象工厂类中声明了工厂方法( Factory Method ),用于返回一个产品. 抽象工厂是工厂方法模式的核心,所有创建对象的工厂类都必须实现该接口.</em></li>
<li><em><code>ConcreteFactory (具体工厂)</code> : 它是抽象工厂类的子类,实现了在抽象工厂中声明的工厂方法,并由客户端调用,返回一个具体产品类的实例.</em></li>
</ol>
<h3 id="程序示例-简洁版"><a href="#程序示例-简洁版" class="headerlink" title="程序示例-简洁版"></a>程序示例-简洁版</h3><p><em>下面是一个实现了Factory Method模式的简单示例程序,该示例程序的功能( 模拟 )是为了提高多种日志记录器之间切换的灵活性.</em></p>
<ol>
<li><p><em>Logger接口 : 日志记录器接口, 充当抽象产品角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 日志记录器接口, 充当抽象产品角色</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:26 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Logger</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">void</span> <span class="title">writeLog</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>DatabaseLogger类 : 数据库日志记录器, 充当具体产品角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-pattern</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 数据库日志记录器, 充当具体产品角色</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:27 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DatabaseLogger</span> <span class="keyword">implements</span> <span class="title">Logger</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">writeLog</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"this is some logs about database"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>FileLogger类 : 文件日志记录器, 充当具体产品角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 文件日志记录器, 充当具体产品角色</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:30 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FileLogger</span> <span class="keyword">implements</span> <span class="title">Logger</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">writeLog</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"this is some logs about file"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>LoggerFactory类 : 日志记录器工厂接口, 充当抽象工厂角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 日志记录器工厂接口, 充当抽象工厂角色</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:33 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">LoggerFactory</span> </span>&#123;</span><br><span class="line">    <span class="function">Logger <span class="title">createLogger</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>DatabaseLoggerFactory类 : 数据库日志记录器工厂类, 充当具体工厂角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method1;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 数据库日志记录器工厂类, 充当具体工厂角色</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:36 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DatabaseLoggerFactory</span> <span class="keyword">implements</span> <span class="title">LoggerFactory</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Logger <span class="title">createLogger</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> DatabaseLogger();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>FileLoggerFactory类 : 文件日志记录器工厂类, 充当具体工厂角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 文件日志记录器工厂类, 充当具体工厂角色</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:38 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FileLoggerFactory</span> <span class="keyword">implements</span> <span class="title">LoggerFactory</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Logger <span class="title">createLogger</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> FileLogger();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Client类 : 客户端测试类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 客户端测试类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:39 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Client</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        LoggerFactory databaseLoggerFactory = <span class="keyword">new</span> DatabaseLoggerFactory();</span><br><span class="line">        Logger databaseLogger = databaseLoggerFactory.createLogger();</span><br><span class="line">        databaseLogger.writeLog();</span><br><span class="line"></span><br><span class="line">        LoggerFactory fileLoggerFactory = <span class="keyword">new</span> FileLoggerFactory();</span><br><span class="line">        Logger fileLogger = fileLoggerFactory.createLogger();</span><br><span class="line">        fileLogger.writeLog();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行结果如下所示 :</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">this is some logs about database</span><br><span class="line">this is some logs about file</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h4 id="示例程序的类图"><a href="#示例程序的类图" class="headerlink" title="示例程序的类图"></a>示例程序的类图</h4><figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="/2019/09/05/Java设计模式之Factory-Method-Pattern/Factory-Method-Pattern-ClassDiagram1.png" alt title>
                </div>
                <div class="image-caption"></div>
            </figure>
<h3 id="示例程序-工厂方法的重载"><a href="#示例程序-工厂方法的重载" class="headerlink" title="示例程序-工厂方法的重载"></a>示例程序-工厂方法的重载</h3><p><em>下述示例代码文件同上述<code>示例程序-简洁版</code>,既只需修改部分代码即可哟~</em></p>
<ol>
<li><p><em>LoggerFactory接口 : 日志记录器工厂接口, 充当抽象工厂角色(工厂方法的重载)</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 日志记录器工厂接口, 充当抽象工厂角色(工厂方法的重载)</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:33 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">LoggerFactory</span> </span>&#123;</span><br><span class="line">    <span class="function">Logger <span class="title">createLogger</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function">Logger <span class="title">createLogger</span><span class="params">(String args)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function">Logger <span class="title">createLogger</span><span class="params">(Object obj)</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>DatabaseLoggerFactory类 : 数据库日志记录器工厂类, 充当具体工厂角色(工厂方法的重载)</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 数据库日志记录器工厂类, 充当具体工厂角色(工厂方法的重载)</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:36 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DatabaseLoggerFactory</span> <span class="keyword">implements</span> <span class="title">LoggerFactory</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Logger <span class="title">createLogger</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> DatabaseLogger();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> pers.huangyuhui.factory_method.factory_method2.<span class="function">Logger <span class="title">createLogger</span><span class="params">(String args)</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"使用参数"</span> + args + <span class="string">"作为连接字符串来连接数据库,代码省略 ···"</span>);</span><br><span class="line">        Logger logger = <span class="keyword">new</span> DatabaseLogger();</span><br><span class="line">        <span class="comment">//初始化数据库日志记录器,代码省略 ···</span></span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> DatabaseLogger();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> pers.huangyuhui.factory_method.factory_method2.<span class="function">Logger <span class="title">createLogger</span><span class="params">(Object obj)</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"使用封装在"</span> + obj.toString() + <span class="string">"中的连接字符串来连接数据库,代码省略 ···"</span>);</span><br><span class="line">        Logger logger = <span class="keyword">new</span> DatabaseLogger();</span><br><span class="line">        <span class="comment">//使用封装在参数obj中的数据来初始化数据库日志记录器，代码省略 ···</span></span><br><span class="line">        <span class="keyword">return</span> logger;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Client类 : 客户端测试类-(工厂方法的重载)</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 客户端测试类-(工厂方法的重载)</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:39 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Client</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        LoggerFactory databaseLoggerFactory = <span class="keyword">new</span> DatabaseLoggerFactory();</span><br><span class="line">        Logger databaseLogger = databaseLoggerFactory.createLogger(<span class="string">"database-connection-info"</span>);</span><br><span class="line">        databaseLogger.writeLog();</span><br><span class="line"></span><br><span class="line">        LoggerFactory fileLoggerFactory = <span class="keyword">new</span> FileLoggerFactory();</span><br><span class="line">        Logger fileLogger = fileLoggerFactory.createLogger();</span><br><span class="line">        fileLogger.writeLog();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行结果如下所示 :</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">使用参数database-connection-info作为连接字符串来连接数据库,代码省略 ···</span><br><span class="line">this is some logs about database</span><br><span class="line">this is some logs about file</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h4 id="示例程序的类图-1"><a href="#示例程序的类图-1" class="headerlink" title="示例程序的类图"></a>示例程序的类图</h4><figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="/2019/09/05/Java设计模式之Factory-Method-Pattern/Factory-Method-Pattern-ClassDiagram2.png" alt title>
                </div>
                <div class="image-caption"></div>
            </figure>
<h3 id="示例程序-工厂方法的隐藏"><a href="#示例程序-工厂方法的隐藏" class="headerlink" title="示例程序-工厂方法的隐藏"></a>示例程序-工厂方法的隐藏</h3><p><em>下述示例代码文件同上述<code>示例程序-简洁版</code>,既只需修改部分代码即可哟~</em></p>
<ol>
<li><p><em>LoggerFactory类 : 日志记录器工厂接口, 充当抽象工厂角色(工厂方法的隐藏)</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method3;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 日志记录器工厂接口, 充当抽象工厂角色(工厂方法的隐藏)</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:33 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="class"><span class="keyword">class</span> <span class="title">LoggerFactory</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//工厂方法的隐藏</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">writeLog</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        Logger logger = <span class="keyword">this</span>.createLogger();</span><br><span class="line">        logger.writeLog();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">abstract</span> Logger <span class="title">createLogger</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>DatabaseLoggerFactory类 : 数据库日志记录器工厂类, 充当具体工厂角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DatabaseLoggerFactory</span> <span class="keyword">extends</span> <span class="title">LoggerFactory</span> </span>&#123; · · · · · ·</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>FileLoggerFactory类 : 文件日志记录器工厂类, 充当具体工厂角色</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FileLoggerFactory</span> <span class="keyword">extends</span> <span class="title">LoggerFactory</span> </span>&#123; · · · · · ·</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Client类 : 客户端测试类(工厂方法的隐藏)</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.factory_method.factory_method3;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 客户端测试类(工厂方法的隐藏)</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 9/5/2019-9:39 AM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Client</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">new</span> DatabaseLoggerFactory().writeLog();</span><br><span class="line">        <span class="comment">//LoggerFactory databaseLoggerFactory = new DatabaseLoggerFactory();</span></span><br><span class="line">        <span class="comment">//Logger databaseLogger = databaseLoggerFactory.createLogger();</span></span><br><span class="line">        <span class="comment">//databaseLogger.writeLog();</span></span><br><span class="line"></span><br><span class="line">        <span class="keyword">new</span> FileLoggerFactory().writeLog();</span><br><span class="line">        <span class="comment">//LoggerFactory fileLoggerFactory = new FileLoggerFactory();</span></span><br><span class="line">        <span class="comment">//Logger fileLogger = fileLoggerFactory.createLogger();</span></span><br><span class="line">        <span class="comment">//fileLogger.writeLog();</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行结果如下所示 :</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">this is some logs about database</span><br><span class="line">this is some logs about file</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h4 id="示例程序的类图-2"><a href="#示例程序的类图-2" class="headerlink" title="示例程序的类图"></a>示例程序的类图</h4><figure class="image-bubble">
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